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package/lua: implement memory limits, scripts can use get_memory_limit() and set_memory_limit() to cap the maximum ram usage

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SVN-Revision: 16753
This commit is contained in:
Jo-Philipp Wich 2009-07-09 17:45:23 +00:00
parent b8a97ca5c5
commit 03db00a803
3 changed files with 294 additions and 17 deletions
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2
package/lua/Makefile
View file

@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
PKG_NAME:=lua
PKG_VERSION:=5.1.4
PKG_RELEASE:=3
PKG_RELEASE:=4
PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
PKG_SOURCE_URL:=http://www.lua.org/ftp/ \

277
package/lua/patches/040-memory-limits.patch Normal file
View file

@ -0,0 +1,277 @@
--- a/src/lapi.c
+++ b/src/lapi.c
@@ -716,14 +716,14 @@
LUA_API void lua_setfield (lua_State *L, int idx, const char *k) {
StkId t;
- TValue key;
lua_lock(L);
api_checknelems(L, 1);
t = index2adr(L, idx);
api_checkvalidindex(L, t);
- setsvalue(L, &key, luaS_new(L, k));
- luaV_settable(L, t, &key, L->top - 1);
- L->top--; /* pop value */
+ setsvalue2s(L, L->top, luaS_new(L, k));
+ api_incr_top(L);
+ luaV_settable(L, t, L->top - 1, L->top - 2);
+ L->top -= 2; /* pop key and value */
lua_unlock(L);
}
@@ -971,7 +971,12 @@
break;
}
case LUA_GCCOLLECT: {
- luaC_fullgc(L);
+ lu_mem old_thres = g->GCthreshold;
+ if(g->GCthreshold != MAX_LUMEM) {
+ g->GCthreshold = MAX_LUMEM;
+ luaC_fullgc(L);
+ g->GCthreshold = old_thres;
+ }
break;
}
case LUA_GCCOUNT: {
--- a/src/ldo.c
+++ b/src/ldo.c
@@ -494,6 +494,7 @@
struct SParser *p = cast(struct SParser *, ud);
int c = luaZ_lookahead(p->z);
luaC_checkGC(L);
+ lua_gc(L, LUA_GCSTOP, 0); /* stop collector during parsing */
tf = ((c == LUA_SIGNATURE[0]) ? luaU_undump : luaY_parser)(L, p->z,
&p->buff, p->name);
cl = luaF_newLclosure(L, tf->nups, hvalue(gt(L)));
@@ -502,6 +503,7 @@
cl->l.upvals[i] = luaF_newupval(L);
setclvalue(L, L->top, cl);
incr_top(L);
+ lua_gc(L, LUA_GCRESTART, 0);
}
--- a/src/lgc.c
+++ b/src/lgc.c
@@ -437,7 +437,10 @@
/* check size of buffer */
if (luaZ_sizebuffer(&g->buff) > LUA_MINBUFFER*2) { /* buffer too big? */
size_t newsize = luaZ_sizebuffer(&g->buff) / 2;
- luaZ_resizebuffer(L, &g->buff, newsize);
+ /* make sure newsize is larger then the buffer's in use size. */
+ newsize = (luaZ_bufflen(&g->buff) > newsize) ? luaZ_bufflen(&g->buff) : newsize;
+ if(newsize < luaZ_sizebuffer(&g->buff))
+ luaZ_resizebuffer(L, &g->buff, newsize);
}
}
--- a/src/lstate.c
+++ b/src/lstate.c
@@ -118,7 +118,6 @@
lua_State *luaE_newthread (lua_State *L) {
lua_State *L1 = tostate(luaM_malloc(L, state_size(lua_State)));
- luaC_link(L, obj2gco(L1), LUA_TTHREAD);
preinit_state(L1, G(L));
stack_init(L1, L); /* init stack */
setobj2n(L, gt(L1), gt(L)); /* share table of globals */
@@ -126,6 +125,7 @@
L1->basehookcount = L->basehookcount;
L1->hook = L->hook;
resethookcount(L1);
+ luaC_link(L, obj2gco(L1), LUA_TTHREAD);
lua_assert(iswhite(obj2gco(L1)));
return L1;
}
--- a/src/lstring.c
+++ b/src/lstring.c
@@ -53,6 +53,9 @@
stringtable *tb;
if (l+1 > (MAX_SIZET - sizeof(TString))/sizeof(char))
luaM_toobig(L);
+ tb = &G(L)->strt;
+ if ((tb->nuse + 1) > cast(lu_int32, tb->size) && tb->size <= MAX_INT/2)
+ luaS_resize(L, tb->size*2); /* too crowded */
ts = cast(TString *, luaM_malloc(L, (l+1)*sizeof(char)+sizeof(TString)));
ts->tsv.len = l;
ts->tsv.hash = h;
@@ -61,13 +64,10 @@
ts->tsv.reserved = 0;
memcpy(ts+1, str, l*sizeof(char));
((char *)(ts+1))[l] = '\0'; /* ending 0 */
- tb = &G(L)->strt;
h = lmod(h, tb->size);
ts->tsv.next = tb->hash[h]; /* chain new entry */
tb->hash[h] = obj2gco(ts);
tb->nuse++;
- if (tb->nuse > cast(lu_int32, tb->size) && tb->size <= MAX_INT/2)
- luaS_resize(L, tb->size*2); /* too crowded */
return ts;
}
--- a/src/ltable.c
+++ b/src/ltable.c
@@ -371,7 +371,6 @@
Table *luaH_new (lua_State *L, int narray, int nhash) {
Table *t = luaM_new(L, Table);
- luaC_link(L, obj2gco(t), LUA_TTABLE);
t->metatable = NULL;
t->flags = cast_byte(~0);
/* temporary values (kept only if some malloc fails) */
@@ -381,6 +380,7 @@
t->node = cast(Node *, dummynode);
setarrayvector(L, t, narray);
setnodevector(L, t, nhash);
+ luaC_link(L, obj2gco(t), LUA_TTABLE);
return t;
}
--- a/src/lvm.c
+++ b/src/lvm.c
@@ -375,6 +375,7 @@
if (l >= MAX_SIZET - tl) luaG_runerror(L, "string length overflow");
tl += l;
}
+ G(L)->buff.n = tl;
buffer = luaZ_openspace(L, &G(L)->buff, tl);
tl = 0;
for (i=n; i>0; i--) { /* concat all strings */
@@ -383,6 +384,7 @@
tl += l;
}
setsvalue2s(L, top-n, luaS_newlstr(L, buffer, tl));
+ luaZ_resetbuffer(&G(L)->buff);
}
total -= n-1; /* got `n' strings to create 1 new */
last -= n-1;
--- a/src/lua.c
+++ b/src/lua.c
@@ -19,6 +19,82 @@
#include "llimits.h"
+typedef struct {
+ char *name;
+ lua_State *L;
+ size_t memused;
+ size_t peak_memused;
+ size_t max_memused;
+ int collecting;
+} script_info_t;
+
+
+static void *script_alloc(void *ud, void *ptr, size_t osize, size_t nsize)
+{
+ script_info_t *info=(script_info_t *)ud;
+ size_t old_size = info->memused;
+
+ info->memused -= osize;
+ if (nsize == 0) {
+ free(ptr);
+ return NULL;
+ }
+ info->memused += nsize;
+ if(info->max_memused > 0 && nsize > osize && info->memused >= info->max_memused) {
+#ifdef LOW_MEM_DEBUG
+ printf("LOW MEM: 1 osize=%zd, nsize=%zd, used=%zu, peak=%zu, need=%zd\n", osize, nsize,
+ info->memused, info->peak_memused, (info->memused - info->max_memused));
+#endif
+ info->memused = old_size;
+ /* don't allow a recursive garbage collection call. */
+ if(info->collecting != 0) {
+ return NULL;
+ }
+ info->collecting = 1;
+ /* try to free memory by collecting garbage. */
+ lua_gc(info->L, LUA_GCCOLLECT, 0);
+ info->collecting = 0;
+#ifdef LOW_MEM_DEBUG
+ printf("LOW MEM: 2 used=%zu, peak=%zu\n", info->memused, info->peak_memused);
+#endif
+ /* check memory usage again. */
+ old_size = info->memused;
+ info->memused -= osize;
+ info->memused += nsize;
+ if(info->memused >= info->max_memused) {
+ info->memused = old_size;
+#ifdef LOW_MEM_DEBUG
+ printf("OUT OF MEMORY: memused=%zd, osize=%zd, nsize=%zd\n", info->memused, osize, nsize);
+#endif
+ return NULL;
+ }
+ }
+ if(info->memused > info->peak_memused) info->peak_memused = info->memused;
+ return realloc(ptr, nsize);
+}
+
+static int set_memory_limit(lua_State *L)
+{
+ int limit = luaL_checknumber(L, 1);
+ script_info_t *info;
+ lua_getallocf(L, (void *)(&info));
+
+ if( limit >= 0 )
+ info->max_memused = limit;
+
+ lua_pushnumber(L, limit);
+ return 1;
+}
+
+static int get_memory_limit(lua_State *L)
+{
+ script_info_t *info;
+ lua_getallocf(L, (void *)(&info));
+ lua_pushnumber(L, info->max_memused);
+ return 1;
+}
+
+
static lua_State *globalL = NULL;
static const char *progname = LUA_PROGNAME;
@@ -377,11 +453,28 @@
int main (int argc, char **argv) {
int status;
struct Smain s;
- lua_State *L = lua_open(); /* create state */
+ script_info_t *info;
+
+ info = (script_info_t *)calloc(1, sizeof(script_info_t));
+ info->max_memused = 0;
+ info->collecting = 0;
+ info->name = argv[0];
+ info->memused = 0;
+ info->peak_memused = 0;
+
+ lua_State *L = lua_newstate(script_alloc, info);
+
if (L == NULL) {
l_message(argv[0], "cannot create state: not enough memory");
return EXIT_FAILURE;
}
+
+ info->L = L;
+
+ luaL_openlibs(L);
+ lua_register(L, "set_memory_limit", set_memory_limit);
+ lua_register(L, "get_memory_limit", get_memory_limit);
+
/* Checking 'sizeof(lua_Integer)' cannot be made in preprocessor on all compilers.
*/
#ifdef LNUM_INT16
@@ -396,6 +489,14 @@
status = lua_cpcall(L, &pmain, &s);
report(L, status);
lua_close(L);
+
+#ifdef LOW_MEM_DEBUG
+ printf("%s: memused=%zd, peak_memused=%zd\n", info->name,
+ info->memused, info->peak_memused);
+#endif
+
+ free(info);
+
return (status || s.status) ? EXIT_FAILURE : EXIT_SUCCESS;
}

32
package/lua/patches/300-opcode_performance.patch
View file

@ -10,7 +10,7 @@
/*
* If 'obj' is a string, it is tried to be interpreted as a number.
@@ -562,12 +565,63 @@
@@ -564,12 +567,63 @@
ARITH_OP1_END
#endif
@ -74,7 +74,7 @@
reentry: /* entry point */
lua_assert(isLua(L->ci));
pc = L->savedpc;
@@ -592,33 +646,33 @@
@@ -594,33 +648,33 @@
lua_assert(base == L->base && L->base == L->ci->base);
lua_assert(base <= L->top && L->top <= L->stack + L->stacksize);
lua_assert(L->top == L->ci->top || luaG_checkopenop(i));
@ -115,7 +115,7 @@
TValue g;
TValue *rb = KBx(i);
sethvalue(L, &g, cl->env);
@@ -626,88 +680,88 @@
@@ -628,88 +682,88 @@
Protect(luaV_gettable(L, &g, rb, ra));
continue;
}
@ -219,7 +219,7 @@
const TValue *rb = RB(i);
switch (ttype(rb)) {
case LUA_TTABLE: {
@@ -727,18 +781,18 @@
@@ -729,18 +783,18 @@
}
continue;
}
@ -241,7 +241,7 @@
TValue *rb = RKB(i);
TValue *rc = RKC(i);
Protect(
@@ -748,7 +802,7 @@
@@ -750,7 +804,7 @@
pc++;
continue;
}
@ -250,7 +250,7 @@
Protect(
if (luaV_lessthan(L, RKB(i), RKC(i)) == GETARG_A(i))
dojump(L, pc, GETARG_sBx(*pc));
@@ -756,7 +810,7 @@
@@ -758,7 +812,7 @@
pc++;
continue;
}
@ -259,7 +259,7 @@
Protect(
if (lessequal(L, RKB(i), RKC(i)) == GETARG_A(i))
dojump(L, pc, GETARG_sBx(*pc));
@@ -764,13 +818,13 @@
@@ -766,13 +820,13 @@
pc++;
continue;
}
@ -275,7 +275,7 @@
TValue *rb = RB(i);
if (l_isfalse(rb) != GETARG_C(i)) {
setobjs2s(L, ra, rb);
@@ -779,7 +833,7 @@
@@ -781,7 +835,7 @@
pc++;
continue;
}
@ -284,7 +284,7 @@
int b = GETARG_B(i);
int nresults = GETARG_C(i) - 1;
if (b != 0) L->top = ra+b; /* else previous instruction set top */
@@ -800,7 +854,7 @@
@@ -802,7 +856,7 @@
}
}
}
@ -293,7 +293,7 @@
int b = GETARG_B(i);
if (b != 0) L->top = ra+b; /* else previous instruction set top */
L->savedpc = pc;
@@ -832,7 +886,7 @@
@@ -834,7 +888,7 @@
}
}
}
@ -302,7 +302,7 @@
int b = GETARG_B(i);
if (b != 0) L->top = ra+b-1;
if (L->openupval) luaF_close(L, base);
@@ -847,7 +901,7 @@
@@ -849,7 +903,7 @@
goto reentry;
}
}
@ -311,7 +311,7 @@
/* If start,step and limit are all integers, we don't need to check
* against overflow in the looping.
*/
@@ -875,7 +929,7 @@
@@ -877,7 +931,7 @@
}
continue;
}
@ -320,7 +320,7 @@
const TValue *init = ra;
const TValue *plimit = ra+1;
const TValue *pstep = ra+2;
@@ -898,7 +952,7 @@
@@ -900,7 +954,7 @@
dojump(L, pc, GETARG_sBx(i));
continue;
}
@ -329,7 +329,7 @@
StkId cb = ra + 3; /* call base */
setobjs2s(L, cb+2, ra+2);
setobjs2s(L, cb+1, ra+1);
@@ -914,7 +968,7 @@
@@ -916,7 +970,7 @@
pc++;
continue;
}
@ -338,7 +338,7 @@
int n = GETARG_B(i);
int c = GETARG_C(i);
int last;
@@ -936,11 +990,11 @@
@@ -938,11 +992,11 @@
}
continue;
}
@ -352,7 +352,7 @@
Proto *p;
Closure *ncl;
int nup, j;
@@ -960,7 +1014,7 @@
@@ -962,7 +1016,7 @@
Protect(luaC_checkGC(L));
continue;
}